Crankpin bearing



April 29, 1941. T. v. BucKwALn-ER CRANKPIN BEARING Filed Feb. 1, 1937 2Sheets-Sheet l www pril 29, 1941 T. v. BUQKWALTER CRANKPIN BEARING FiledFeb. l, 1937 2 Sheets-Sheet 2 /N VEA/roe:

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ww www Patented Apr. 29, 1941 CRANKPIN BEARING Tracy V. Buckwalter,Canton, Ohio, assigner to The Timken Roller Bearing Company, Canton,Ohio, a corporation of Ohio Application February 1, 1937, Serial No.123,373

5 Claims.

My invention relates to bearings for locomotive and other crankpins andis an improvement of my copending application Serial No. 110,826 ledNovember 14, 1936, for patent for Crankpin bearing now Patent No.2,148,149. It has for its principal object a plain bearing arrangementfor suchr crankpins which has many of the advantages of the rollerbearing crankpin construction of my Patent No, 1,951,126. Otherobjectsare strength and simplicity of construction, easy assembly anddisassembly of the bearings, adequate lubrication and accommodation ofthe cooking of drive rods which necessarily occurs in locomotiveservice. The invention consists in the cranicpin bearing and in theparts and combinations4 and arrangements of parts hereinafter describedand claimed.

In the accompanying drawings- Fig. 1 is a sectional view of a maincrankpin bearing embodying my invention, together with portions of thelocomotive drive rods;

Fig, 2 is a horizontal sectional View through a plurality of crankpinbearings and drive rods;

Fig. 3 is a sectional view of the rear wheelpbearingyand j Fig. 4 is asectional View of the front wheel bearing. 5 y 'p In Fig. lisillustrated the hollow main crankpin l of a locomotive drivewheel 2. Theinnermost portion 3 of saidcrankpin, that is the portion adjacent to thewheel, is of larger outside diameter than the body portion 4 outwardlythereof and the outermost end portion 5 is further reduced in diameter.

l'totatably mounted on the enlarged innermost portion 3 of the `crankpinI, adjacent to the wheel hub, is a plain bearing, preferably a floatingbushing or sleeve t of bronze or other bearing metal. Rotatably mountedon the reduced body portion il; of the crank pin adjacent to saidinnermost portion` 3 is a second iioating bushing or bearing sleeve l,also of bronze or other suitable bearing metal, whose outside diameteris the same as the outside diameter of the above mentioned bearingsleeve G and whose innermost end is seated againstthe shoulder il formedby the end of the enlarged innermost portion of the lcrankpin. Fixed onthe outermost end portion 5 of the crankpin I, as by doWel pins 9, is asecuring member IIJ in the form of a valve gear return crank which has aflat inner face II bearing against the outer end of the floatingbronze'bushing I and projecting radially :therebeyond 'Rotatable on thebushing 6 and the bushing I 4is a floating main bushing or sleeve I2,which is preferably of iron or steel or other hard, strong metal and is`provided at its outer end withV threaded holes I2a adapted to receivethe threaded ends of pulling rods (not shown). This main bushing I2 isheldin place by means of an abutment ring I3, which is mounted on` theoutermost end of the floating bushingv I between the main bushing andthe valve gear return crank Ii), and an abutment ring I3awhich ismounted on the innermost end of the floating bushing 6 between said mainbushing and the drive wheel 2. The outer ring I3 has an 'inwardlyprojecting flange I i around the periphery of its inner face,overlapping the reduced outerend of the main bushing I2. Said outermostring is held in place by said securing memberV I Whicheverlaps it. Theinner ring i3d is likewise provided with a flange Ma that overlaps thereduced inner end of the main bushing.

Mounted on the main bushing I2 by means of a circular eye I6 is the maindrive rod I, the eye preferablyhaving a liner ring I8 of bronze or othersuitable bearing metal. The main rod I1 extends forwardly to the crosshead of the locomotive (not shown) by which it `is driven and to whichit is connected in any suitable way. Similarly mounted on the mainbushing I2 outwardly of the main rod I'I is a'rear side rod I9 having aneye 2d lined with a bearing ring 2|. Said rear side rod I9 extendsrearwardly to the crankpin 22 of the next adjacent drive wheel 23 whereit is mounted on said pin by means of` another eye 20 lined with abearing ring 2|.

Similarly mounted on the main bushing I2 adjacent to the inner ring Itais a front side rod 33 having an eye 34 provided with a bearing ring 35.Said front side rod extends forwardly to the crankpin 36 of the nextadjacent locomotive drive wheel 31 and is mounted on said pin by meansof another eye 34 provided with a bearing ring 35. Mounted on `the mainbushing I2 between the eye I6, of the main rod II and the eye 311 of thefront side rod 33 is a channel-shaped split spacer member 32 securedtogether by bolts 3I and nuts 32.

As shown in the drawings, the bearings for the crankpins 22 and 35 areplain bearings of `the same construction. Each of these crankpinbearings comprises a bushing 38 of bronze or other material rotatablymounted on the crankpin, and a main bushing 39 of cast iron or otherhard metal rotatably mounted on said bronze bushing and rotatable in thebearingv ring in the eye of the side rod cooperating with said pin. Themain bushing 3,9 is provided -at .its outer end with threaded holes 39a,similar Ito those in the main bushing I2, adapted to receive thethreaded ends of pulling rods (not shown). A cap 4I secured to the endof the crankpin has an annular zone 42 engaging the end of the floatingbushing 38, an inwardly stepped annular `Zone 43 that overlaps saidbushing and that engages the outer end of the main bushing 38, and aninwardly stepped peripheral zone 44 that overlaps said main bushing andserves as a stop for the side rod mounted thereon. A ring 45 is mountedon the innermost end of the oating bushing 38 and has an axially offsetperipheral flange 45a seated on the reduced inner end ofV the mainbushing 30 that serves as a stop for the other side of said side rod.

As shown in the drawings, the rods are loosely mounted on the mainbushings of the crankpins an-d the abutment members for the sides ofsaid rods are-spaced apart sufficiently to permit relative movement ofsaid rods and bushings axially of the latter. Thus, cooking of the rods,incident to locomotive service, is accommodated. The dotted lines in thedrawings show the rods in cocked position.

Mounted in the bore of the main crankpin I is a lubricating device 46,preferably of the type disclosed in my Patent No. 2,040,803. Thecrankpin I is provided with radial passageways 47 therethrough and thefloating bushing 6 and the floating bushing 'I are also provided with aplurality of radial passageways 48 therethrough. The main bushing I 2 isprovided with radial passageways 49 whose outer ends open into theseveral bearing liners in the eyes of the rods. The radial passageways49 in said bushing are preferably provided with suitable wick members5I. Thus, lubricant from the crankpin bore passes through thepassageways 41 of the crankpin, the passageways 48 of the floatingbushings and the passageways 49 of the main bushing into the annularperipheral passageways 50 where it is distributed over the bronze linermembers. The passageways 41 of the crank Ipin are not in directalinement with those 48 of the floating bushings and the passageways 48of the iloating bushings are not in direct alinement with those 48 ofthe main bushing, so that some of the oil finds its way into the spacesbetween the crankpin I and the floating bushings 6 and 'l and the spacebetween the floating bushings, and the main bushing I2. Thus all movingparts are adequately lubricated, the :dow of lubricant being controlledby lubricating device 46 in the crankpin. To prevent escape oflubricant, split rings 52, similar to the commonly used piston rings,are seated in annular grooves 53 near the ends of the oating bushings 6and 1, bearing against the inner periphery of the main bushing I2. Thus,outward escape of the lubricant at these points is prevented and aninternal pressure is built up that forces the lubricant to spread alongthe several bearing surfaces.

Mounted in the bore of each of the crankpins 22 and 35 is a lubricatingdevice 4ta similar to the lubricating device 45 hereinbefore described.Lubricant from said bore passes through radial passageway/s 47a in saidcrankpin, thence through radial passageways 48a in the floating bushing38 and thence through radial passageways 4,90. in the main bushing 30ainto the space between said main bushing and the bronze liner or bearingring in the cooperating eye of the side rod. The passageways 49a areprovided with suitable wick members 5Ia. Escape of lubricant isprevented by split rings 52a seated in annular grooves 53a near the endsof the floating bushing 33.

It will be seen that the above bearing is one that can be used onstepped crankpns similar to those now commonly in use and that it can beeasily substituted for the roller bearing arrangement of my Patent No.1,951,126. Cooking of the main rod and side rods, which is inevitable inservice, is accommodated without destroying the full surface bearing ofthe crankpins on the floating bushings and the main bushings. The use oftwo floating bushings permits the relative movement between them that islikely to occur due to the larger load on the larger floating bushing.The load from piston to crankpins is largely transmitted through themain bushings instead of passing through the bearings and the mainbushing is preferably made of iron or steel or other strong material soas to have greater load carrying and transmitting capacity. The floatingbushings and the main bushing of each crankpin bearing may be quicklyand easily removed and re-serviced without disturbing the rods merely byremoving the ring or cap at the outer end of the main bushing; and thethreaded holes in the outer end of said main bushing afford means forattaching a pulling device thereto.

It is obvious that bearings of the' kind above described may be placedon the crankpins of locomotive drive arrangements of all kinds, from asimple single drive wheel and single drive rod arrangement up to thelargest multiple drive wheel arrangements. Likewise, the plain bearingarrangement may be used on all crankpins or on the main crankpin and oneor more of the other crankpins, while still other crankpins have rollerbearings of the kind shown in my said Patent No. 1,951,126. Obviously,numerous changes may be made without ldeparting from the inventionv andI do not wish to be limited to the precise construction shown.

What I claim is:

1. A locomotive rod bearing comprising a driving wheel having acrankpin, a floating bushing thereon, a lloating main bushing on saidrst mentioned bushing, a rod having an opening rotatably receiving saidmain bushing, and abutment means for the sides of said rod, the abutmentmeans for the inner side of said rod comprising an annular abutmentmember mounted on the inner end of said rst mentioned bushing betweensaid wheel and said rod but unsecured to said main bushing, whereby saidmain bushing is insertable in and removable from said bearing withoutremoving said rod or said annular abutment member.

2. A locomotive rod bearing comprising a driving wheel having acrankpin, a floating bushing thereon, a floating main bushing on saidrst mentioned bushing, and a rod having an opening rotatably receivingsaid main bushing, and an annular abutment member for the inner side ofsaid rod sleeved on the inner end of said first mentioned bushingopposite to but entirely unsecured to the inner end of said mainbushing, whereby said main bushing is insertable in and removable fromsaid bearing independently of said rod and said annular abutment member.

3. A locomotive rod bearing comprising a driving wheel having a crankpinwith an outer end portion of smaller outside diameter than its inner endportion, separate floating bushings on the respective diameters of saidpin and having the same outside diameter, a oating main bushing on saidrst mentioned bushing, a rod having an opening rotatably receiving saidmain bushing, and a ring mounted on the innermost of said irst mentionedbushings and having a portion overlapping the inner end portion of saidmain bushing and forming an abutment for the inner side of said rod,said ring being entirely unsecured to said main bushing, whereby saidmain bushing is adapted to` be inserted in and removed from said openingthrough the outer end thereof.

4. A locomotive rod bearing comprising a driving wheel having acrankpin, a floating bushing thereon, a iioating main bushing on saidrst mentioned bushing, a rod having `an opening rotatably receiving saidmain bushing, and a ring mounted on said first mentioned bushing betweensaid wheel and said rod and having a portion overlapping the inner endof said main bushing and forming van abutment for the inner side of saidrod, said ring being unsecured to said main bushing, whereby said mainbushing is insertable in and removable from said bearing independentlyof said rod, the outer end of said main bushing being provided withopenings adapted for cooperation with a suitable pulling device, aretaining member removably secured to the outer end of said crankpin,and a ring mounted around said crankpin between said rod and saidretaining member and having a portion `covering the openings in theouter end of said main bushing and a portion forming an abutment for theouter side of said rod.

5. A locomotive rod bearing comprising a driving wheel having a crankpinwith an outer end portion of smaller outside diameter than its inner endportion, separate oating bushings on the respective diameters of saidpin and having the same outside diameter, a floating main bushing onsaid first mentioned bushings, a rod having an opening rotatablyreceiving said main bushing, 4a ring mounted on the innermost of saidilrst mentioned bushings `and having a portion overlapping but unsecuredto the inner end of said main bushing and constituting an abutment forthe inner side of said rod, a member mounted on the outermost of saidfirst mentioned bushings and having a portion overlapping but unsecuredto the outer end of said main bushing and constituting an abutment forthe outer side of said rod, and a member xed to the outer end of saidcrankpin for holding said bushings, said rods and said abutment ring andmember in place.

TRACY V. BUCKWALTER.

